package com.learn.designpattern.singleton.type1;

public class SingletonTest01 {

    public static void main(String[] args) {
        Singleton instance=Singleton.getInstance();
        Singleton instance2=Singleton.getInstance();
        System.out.println(instance==instance2);
        System.out.println("instance.hashCode=" + instance.hashCode());
        System.out.println("instance2.hashCode=" + instance2.hashCode());
    }
}

//饿汉式(静态变量)

class Singleton{

    //1. 构造器私有化, 外部能new
    private Singleton() {

    }

    //2.本类内部创建对象实例
    private final static Singleton instance=new Singleton();

    //3. 提供一个公有的静态方法，返回实例对象
    public static Singleton getInstance(){
        return instance;
    }
}
